1. Eat several small mini-meals all day instead of 3 big ones. Aim for 6-8 per day. This keeps your metabolism and energy level much more even throughout the day. If you eat your last one before 8pm you may notice losing a few pounds in your sleep as well.
2. Yerba Mate. Magical stuff. Much more sustained and focused energy for a longer period of time than coffee. Once it wears off you don't crash like coffee either.
3. Replace..............With
-- Red meat.............Fish (and white meat if fish is too expensive)
-- White bread........Whole grain bread. A popular switch...make it.
-- Soda....................Tea? Or at least 100% fruit juice.
-- Peanut butter.......Natural peanut butter. Skippy natural is as good as normal.
-- Sugar...................Nothing. You don't need it.
4. Start reading labels. Remember: Not all calories are created equal. Look for how many of the total carbs of an item are from sugar. Look how many total calories are from fat.
Look for these 4-letter words... -- Hydrogenated oil -- Artificial _____ -- >4 syllables and you can't pronounce it (Yeah, someone's going to disagree. I'm just saying it's a rule of thumb)
Those are just a few I use daily. I hope some other people add to this list.